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Lacking a meter, at least get #44 bulb to dip the K current. Is there a RS store near you?
The dip point is very sharp, and if the coil is off dip, the current can be dangerously high and you'd never know it, even if the tube isn't red plating yet.
You're right about letting moisture cook off to see if the hiss goes away. But get the K current dipped first.
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